Grinding tool



June 16, 1959 E. B. WICKLAND 2,890,550

GRINDING TOOL Filed May 29, 1958 I 2 Sheets-Sheet 1 INVENTOR.

EDWARD S. WlCKL AND WMW $9M AT ORNEYS E. B. WICKLAND GRINDING TOOL June 16, 1959 2 Sheets-Shet 2 Filed May 29, 1958 INVENTOR. EDWARD B- WICKLAND A Q 2 NE (5 P patented June 16 1959 2,890,550 GRINDING TOOL Edward B. Wickland, Pollock Pines, Calif. Application May 29, 1958, Serial No. 738,765 3 'Claims. (Cl. 51184.4)

The present invention relates to grinding tools generally and specifically to a bone for a crank shaft.

An object of the present invention is to provide a hone for a crank shaft which lends itself to honing the pins or throws of an engine crank shaft without removing the crank shaft from the engine.

Another object of the present invention is to provide a crank shaft hone which enables a user thereof to progressively adjust the abrading elements to deeper cuts without stopping the honing operation and without removing the hone from the crank shaft.

A further object of the present invention is to provide a crank shaft hone which is readily adjustable for all diameters of crank shaft throws, one which is easily and readily mounted upon the crank shaft throw and as readily removed therefrom, and one which is highly effective in action.

A still further object of the present invention is to provide a grinding tool which is sturdy in construction, one simple in structure, and one which is economically feasible.

These and other objects and advantages of the present invention will be fully apparent from the following description when taken in conjunction with the annexed drawings, in which:

Figure 1 is a plan view of the grinding tool according to the present invention, seen from the side,

Figure 2 is a plan view seen from the top in Figure 1,

Figure 3 is a sectional view on an enlarged scale, as seen on line 33 of Figure 1,

Figure 4 is a partial plan view as seen on the other side from Figure 1, the dotted line indicating the open position of the tool frame,

Figure 5 is a view partially in section showing the operation of the tool, the dotted lines showing representing the hand of the user,

Figure 6 is a fragmentary view on an enlarged scale, taken on the line 6-6 of Figure l, and

Figure 7 is an isometric exploded view of the ring and actuating member components of the tool, shown in open position.

Referring in greater detail to the drawings in which like numerals indicate like parts throughout the several views, the grinding tool of the present invention comprises an arcuate frame designated generally by the reference numeral 10 and comprising two sections 12 and 14, the section 14 being hingedly connected by a pivot pin 16 to the section 12 adjacent a handle 18.

A ring, designated generally by the reference numeral 20, is mounted within the frame 10 and is composed of two parts 22 and 24 hingedly connected together by a pin 26 as shown in Figure 7. The ring 20 is conformably shaped to fit within the frame 10. The outer periphery of the ring 20 is formed with a groove 28 extending therearound and three rollers 30, 32 and 34 have their peripheries seated in the groove 28 for support of the ring 20 and rotary movement of the ring 20 in the frame 10. The rollers 30 and 32 are mounted for rotation about transverse axes in the frame section 12 and the roller 34 is mounted for rotation about an axis transversely of and adjacent the free end of the section 14.

An actuator member formed in two pieces 36 and 38,

each semicircular in form, is carried in a groove 40 provided on the inner periphery of the ring 20 for sliding movement between limits in the groove 40. Two cams 42, each having an upwardly sloping face, are carried on each of the actuator member pieces 36 and 38. An abutment 44 is carried on one end of the piece 38 and mating face pieces 46 and 48 are carried upon the one end of the piece 36 and the other end of the piece 38, such ends being in confronting face-to-face abutting relation when the pieces 36 and 38 are within the groove 40.

Four pairs of aligned trunnions 50 project inwardly from the inner periphery of the ring parts 22 and 24, two pairs being on each side and one trunnion 50 of each pair being on each side of the groove 40.

A plurality of arms 52 are arranged in spaced relation within the ring 20, each arm 52 normally lying along the inner periphery of the ring 20 and each arm 52 having one end pivotally connected by a pin 54 to an adjacent pair of trunnions 50. A transversely extending roller 56 is mounted in each arm 52 for rotation about a transverse axis, each roller 56 being engageable on the cam face of the cam 42 adjacent the arm 52.

An abrading element or hone 58 is carried on the free end of each of the arms 52. The cams 42 and the rollers 56 constitute means on the actuator member pieces 36 and 38 and each of the arms 52 for effecting movement of the anus 52 from their normal position lying along the inner periphery of the ring parts 22 and 24 to positions in which the abrading elements or hones 58 are shifted toward the axis of rotation of the ring 20 within the frame 10.

A threaded pin 60 is mounted in the one end of the ring part 22 remote from the pin 26 for longitudinal movement into and out of an unthreaded bore 62 provided in the face of an end head portion 64 formed integrally with and carried by the end of the ring part 22. The head portion 64 is provided with a transversely arranged slot 66 opening toward the center of the ring 20 and a ratchet wheel 68 is mounted upon the portion of the pin 60 which traverses the slot 66. The wheel is threadedly mounted upon the pin 60 and rotation of the wheel 68 effects the longitudinal movement of the pin 60 into and out of the bore 62. The threaded pin 60 is provided with a longitudinally extending slot and a pin 70, carried in one Wall of the slot 66, projects into the slot and prevents rotation of the pin 60.

The head portion 64 of the ring part 22 is provided with a radially arranged bore 72 in which is slidable the intermediate portion of a pawl 74 which has a portion adjacent one end exteriorly of the ring part 22. The other end of the pawl 74 drivingly engages the teeth on the periphery of the ratchet wheel 68. A spring wire 76 mounted upon the side of the ring part 22, as shown in Figure 7, has one end fixed to the ring part 22 and the other end embracingly engaging a side part of the pawl '74 for biasing the pawl 74 to the position in which the one end portion is exteriorly of the ring part 22.

A plunger 78 is mounted in the frame section 14 for movement into a position in which the projecting end portion inwardly of the frame section 14 is in the path of the projecting end portion of the pawl 74, as shown in Figure 5. A coiled spring 80 circumposed about the mid portion of the plunger 7 8 normally biases the plunger 78 to the position in which its end portion is unengaged by the pawl 74 when the ring 20 rotates within the frame 10.

A spring 82 is circumposed about each pin 54 and has its aims bearing against the inner periphery of the ring 20 and against the adjacent roller 56 for biasing the arms 52 to the position in which they are longitudinallyof and lying along the inner periphery of the ring 20. 7

A lever 84 extends longitudinally of the handle 18 and is connected intermediate its ends to the handle 18 for rocking movement about its transverse axis. The end of the lever 84 adjacent the frame section 14 is connected to the frame section 14 by means of a link 86, the link 86 and the projecting portion of the lever 84 being arranged so that an over-center action occurs when the section 14 is moved toward the section 12 to encompass the rotatable ring 20. This over-center action is plainly seen in Figure 4.

A portion of the periphery of the ring 20 on one side is provided with teeth 88 which are meshingly engaged with the teeth of a gear 90 carried on a driven shaft 92 rotatably supported in the frame 10 adjacent the root of the handle 18. The shaft 92 is adapted to be connected to a flexible drive shaft, as shown in Figure 2 in dotted lines and designated by the reference numeral 94.

In use, the grinding tool of the present invention is positioned about the throw of a crank shaft as indicated by a dotted line 96 in Figures 1, 4 and 5, by first releasing the latching lever 84 from its full line position and shifting the same to the dotted line position shown in Figure 4 which effects the opening of the frame sections 12 and 14 away from each other. This permits the removal of the ring 20 and the associated components carried by the ring 20. The ring parts 22 and 24 are then separated by a manually applied pulling force applied to such parts and the parts 22 and 24 are assembled about the crank shaft throw 96. Next, the frame 10 is assembled about the ring 20 with the rollers 30, 32 and 34 riding in the groove 28 provided in the outer periphery of the ring parts 22 and 24. Power means is now connected to the shaft 92 and the gear 90 will proceed to rotate the ring 20 about the crank shaft throw 96.

In Figure is shown in dotted lines a hand 98 representing the hand of the user with the thumb 100 of the hand 98 in position on the free end portion of the plunger 78. Upon application of pressure to the plunger 78 the latter will project into the space in the path of movement of the projecting end portion of the pawl 74 and effect the depressing of the pawl 74 with every revolution of the ring 20. This will effect the actuation of the ratchet wheel 68 to shift the pin 60 outwardly of the head portion 64 of the ring part 22. The end of the pin 60 engages the abutment 44 and drives the actuating member piece 38 slidably along the groove 40. The mating face 48 on the piece 38 engages the face 46 on the piece 36 and effects the sliding movement of the piece 36 in its portion of the groove 40. This effects the engagement of each cam 42 with the adjacent roller 56 to shift the arms 52 about their pivotal pins 54 to the position in which the abrading elements or hones 58 are moved into abrading engagement with the crank shaft throw 96. As the throw 96 is honed, the arms 52 are shifted so that the honing operation proceeds progressively to the depth of cut desired, with the plunger 78 advancing the ratchet wheel 68 a single notch or more with each revolution of the ring 20 within the frame 10.

When the honing operation is completed, the frame is opened by lifting of the lever 34 away from the handle 18 and the actuating member pieces 36 and 38 disconnected from each other simultaneously with opening of the rings parts 22 and 24 to the position shown in Figure 7.

What is claimed is:

1. In a grinding tool, an arcuate-shaped frame, a ring rotatably supported in said frame, a driven shaft rotatably supported in said frame, means drivingly connecting said driven shaft to said ring, an actuating lever conformably shaped to said ring positioned within said ring and connected to said ring for limited sliding movement relative to said ring, a plurality of arms arranged in spaced relation within said ring and each normally lying along the inner periphery of said ring, each arm having one end pivotally connected to said ring for movement of said arm about an axis transverse of said ring from said normal position to a position toward the axis of said ring, an abrading element on the other end of each of said arms, a first means carried by said actuating member and engageable simultaneously with means on each of said arms to move said arms to the position toward the axis of said ring responsive to limited sliding movement of said actuating member relative to said ring, a second means carried by said ring and engaging means formed on said actuating member for effecting the limited sliding movement of the latter, and hand actuable means carried by said frame and engageable with said second means while said ring is rotating to actuate said second means and effect corresponding sliding movement of said actuating member.

2. In a grinding tool, an arcuate-shaped frame, a ring rotatably supported in said frame, a driven shaft rotatably supported in said frame, means drivingly connecting said driven shaft to said ring, an actuating member conformably shaped to said ring positioned within said ring and connected to said ring for limited sliding movement relative to said ring, a plurality of arms arranged in spaced relation within said ring and each normally lying along the inner periphery of said ring, each arm having one end pivotally connected to said ring for movement of said arm about an axis transverse of said ring from the normal position to a position toward the axis of said ring, an abrading element on the other end of each of said arms, a first means embodying spaced cams carried by said actuating members and engage-able simultaneously with a roller on each of said arms to move said arms to the position toward the axis of said ring responsive to limited sliding movement of said actuating member relative to said ring, a second means carried by said ring and engaging means formed on said actuating member for effecting the limited sliding movement of the latter, and hand actuable means carried by said frame and engageable with said second means while said ring is ro tating to actuate said second means and effect corresponding sliding movement of said actuating member.

3. In a grinding tool, an arcuate-shaped frame, a ring rotatably supported in said frame, a driven shaft rotatably supported in said frame, means drivingly connecting said driven shaft to said ring, an actuating member conformably shaped to said ring positioned within said ring and connected to said ring for limited sliding movement relative to said ring, a plurality of arms arranged in spaced relation within said ring and each normally lying along the inner periphery of said ring, each arm having one end pivotally connected to said ring for movement of said arm about an axis transverse of said ring from the normal position to a position toward the axis of said ring, an abrading element on the other end of each of said arms, a first means carried by said actuating member and engageable simultaneously with means on each of said arms to move said arms to the position toward the axis of said ring responsive to limited sliding movement of said actuating member relative to said ring, a second means embodying a longitudinally movable pin carried by said ring and ratchet and pawl means operatively connected to said pin for effecting the longitudinal movement of the latter, said pin engaging an abutment formed on said actuating member for effecting the limited sliding movement of the latter, and hand actuable means embodying a plunger carried by said frame and engageable with the pawl of said ratchet and pawl means while said ring is rotating to actuate the ratchet of said ratchet and pawl means and effecting corresponding sliding movement of said actuating member.

References Cited in the file of this patent UNITED STATES PATENTS 2,138,257 Sievers Nov. 29, 1938 2,291,164 Law July 28, 1942 2,571,779 Stodgell Oct. 16, 1951 FOREIGN PATENTS 369,164 Great Britain Mar. 17, 1932 

